Research

Air Injection Patterns

Featured Video Play Icon

This timelapse video demonstrates the pattern variations occurring when air is injected into a wet granular mixture in a Hele-Shaw cell. When the filling fraction–the percentage of the total volume between the glass sheets taken up by grains–is relatively small, the pattern formed by the injected air develops continuously and looks similar to Saffman-Taylor fingering seen in pure fluids. When the filling fraction is larger, however, the pattern forms in an intermittent fashion with new stick-slip bubbles of air forming as narrow sections of granular material slip and give way. #

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: